Phase coherence discontinuity for sensing signals

Abstract

A first node may transmit a set of sensing signals. The first node may transmit a phase coherence indication based on a set of phase coherence discontinuities associated with the set of sensing signals to a second node. The second node may receive the set of sensing signals. The set of sensing signals received by the second node may be reflected off of a target object. The second node may receive the phase coherence indication based on the set of phase coherence discontinuities associated with the set of sensing signals. The second node may measure the set of sensing signals based on the phase coherence indication. The first node may be a transmitter node. The second node may be a receiver node. The first or second node may be one of a transmission reception point (TRP), a user equipment (UE), a sensing reference unit, or a positioning reference unit.

What is claimed is: 
     
         1 . An apparatus for wireless communication at a first node, comprising:
 one or more memories; and   one or more processors coupled to the one or more memories and, based at least in part on information stored in the one or more memories, the one or more processors is configured to:
 transmit a set of sensing signals; 
 track a phase continuity of the transmitted set of sensing signals; and 
 transmit, for a second node, a phase coherence indication in response to a detection of at least one phase discontinuity of a set of phase coherence discontinuities. 
   
     
     
         2 . The apparatus of  claim 1 , further comprising a transceiver coupled to the one or more processors, wherein the one or more processors is further configured to:
 transmit, via the transceiver, a communication signal between a first transmission of a first sensing signal of the set of sensing signals and a second transmission of a second sensing signal of the set of sensing signals, wherein, to transmit the phase coherence indication, the one or more processors is configured to:
 transmit the phase coherence indication in response to the transmission of the communication signal between the first transmission and the second transmission. 
   
     
     
         3 . The apparatus of  claim 1 , wherein the first node comprises one of a transmission reception point (TRP), a user equipment (UE), a sensing reference unit, or a positioning reference unit. 
     
     
         4 . The apparatus of  claim 1 , wherein, to transmit the phase coherence indication, the one or more processors is configured to:
 transmit the phase coherence indication to at least one of the second node or a sensing entity.   
     
     
         5 . The apparatus of  claim 1 , wherein, to transmit the phase coherence indication, the one or more processors is configured to:
 transmit the phase coherence indication after transmitting the set of sensing signals.   
     
     
         6 . The apparatus of  claim 1 , wherein, to transmit the set of sensing signals, the one or more processors is configured to:
 initiate a transmission of a continuous subset of phase coherent sensing signals in response to detecting a phase coherence discontinuity of the set of phase coherence discontinuities, wherein the continuous subset of phase coherent sensing signals comprises a minimum threshold number of continuous phase coherent sensing signals.   
     
     
         7 . The apparatus of  claim 6 , wherein the one or more processors is further configured to:
 receive an indication of the minimum threshold number from a sensing entity.   
     
     
         8 . The apparatus of  claim 6 , wherein, to transmit the set of sensing signals, the one or more processors is further configured to:
 repeat the initiation of the transmission of the continuous subset of phase coherent sensing signals in response to failing to transmit the continuous subset of sensing signals; and   stop transmission of the set of sensing signals in response to failing to transmit the continuous subset of sensing signals a maximum threshold number of times.   
     
     
         9 . The apparatus of  claim 6 , wherein the one or more processors is further configured to:
 reserve a set of resources associated with the minimum threshold number of continuous phase coherent sensing signals in response to initiating the transmission of the continuous subset of phase coherent sensing signals; and   release the set of resources in response to failing to transmit the continuous subset of sensing signals.   
     
     
         10 . An apparatus for wireless communication at a second node, comprising:
 one or more memories; and   one or more processors coupled to the one or more memories and, based at least in part on information stored in the one or more memories, the one or more processors is configured to:
 receive a set of sensing signals; 
 receive, after a reception of at least one sensing signal of the set of sensing signals, a phase coherence indication based on a set of tracked phase coherence discontinuities associated with the set of sensing signals from a first node; and 
 measure the set of sensing signals based on the phase coherence indication. 
   
     
     
         11 . The apparatus of  claim 10 , wherein the second node comprises one of a transmission reception point (TRP), a user equipment (UE), a sensing reference unit, or a positioning reference unit. 
     
     
         12 . The apparatus of  claim 10 , further comprising a transceiver coupled to the at least one processor, wherein, to receive the phase coherence indication, the one or more processors is configured to:
 receive, via the transceiver, the phase coherence indication after receiving the set of sensing signals.   
     
     
         13 . The apparatus of  claim 10 , wherein, to receive the phase coherence indication, the one or more processors is configured to:
 receive the phase coherence indication between receiving a first sensing signal of the set of sensing signals and receiving a second signal of the set of sensing signals.   
     
     
         14 . The apparatus of  claim 10 , wherein the phase coherence indication comprises a binary indication of an existence or an absence of a phase coherence discontinuity associated with the set of sensing signals. 
     
     
         15 . The apparatus of  claim 14 , wherein, to measure the set of sensing signals based on the phase coherence indication, the one or more processors is configured to:
 divide the set of sensing signals into equal groups of sensing signals;   calculate a phase discontinuity existence probability for each equal group of sensing signals; and   measure a group of sensing signals of the equal groups of sensing signals having a lowest phase discontinuity existence probability.   
     
     
         16 . The apparatus of  claim 15 , wherein the phase coherence indication further comprises a set of position indications associated with the set of sensing signals, wherein each of the set of phase coherence discontinuities corresponds to one of the set of position indications. 
     
     
         17 . The apparatus of  claim 16 , wherein the set of position indications comprises a timestamp or a sensing signal identifier. 
     
     
         18 . The apparatus of  claim 10 , wherein, to measure the set of sensing signals based on the phase coherence indication, the one or more processors is configured to:
 identify a largest continuous subset of phase coherent sensing signals from the set of sensing signals; and   measure the largest continuous subset of phase coherent sensing signals.   
     
     
         19 . The apparatus of  claim 10 , wherein, to measure the set of sensing signals based on the phase coherence indication, the one or more processors is configured to:
 identify a largest continuous subset of phase coherent sensing signals from the set of sensing signals; and   measure the largest continuous subset of phase coherent sensing signals in response to the largest continuous subset of phase coherent sensing signals having a length larger than a minimum threshold value.   
     
     
         20 . The apparatus of  claim 19 , wherein the one or more processors is further configured to:
 receive the minimum threshold value from at least one of the first node or a sensing entity.   
     
     
         21 . The apparatus of  claim 10 , wherein, to measure the set of sensing signals based on the phase coherence indication, the one or more processors is configured to:
 identify a set of continuous subsets of phase coherent sensing signals having a length larger than a minimum threshold value from the set of sensing signals; and   measure the set of sensing signals based on the set of continuous subsets of phase coherent sensing signals.   
     
     
         22 . The apparatus of  claim 21 , wherein, to measure the set of sensing signals based on the set of continuous subsets of phase coherent sensing signals, the one or more processors is configured to:
 measure each of the set of continuous subsets of phase coherent sensing signals; and   average each of the measured set of continuous subsets of phase coherent sensing signals.   
     
     
         23 . The apparatus of  claim 22 , wherein, to measure each of the set of continuous subsets of phase coherent sensing signals, the one or more processors is configured to:
 order each of the measured set of continuous subsets of phase coherent sensing signals by a respective length of each of the set of continuous subsets of phase coherent sensing signals.   
     
     
         24 . The apparatus of  claim 10 , wherein the one or more processors is further configured to:
 transmit a sensing report based on the measured set of sensing signals and the phase coherence indication to a sensing entity.   
     
     
         25 . The apparatus of  claim 24 , wherein the sensing report comprises at least one of a length of a measured continuous subset of phase coherent sensing signals of the set of sensing signals or an average length of a set of measured continuous subsets of phase coherent sensing signals of the set of sensing signals. 
     
     
         26 . The apparatus of  claim 10 , wherein the one or more processors is further configured to:
 receive a modified configuration to increase a number of the set of sensing signals based on a minimum threshold number of continuous phase coherent sensing signals.   
     
     
         27 . The apparatus of  claim 26 , wherein the one or more processors is further configured to:
 calculate an increase to the number of the set of sensing signals based on the minimum threshold number of continuous phase coherent sensing signals and the phase coherence indication.   
     
     
         28 . A method of wireless communication at a first node, comprising:
 transmitting a set of sensing signals;   tracking a phase continuity of the transmitted set of sensing signals; and   transmitting a phase coherence indication in response to a detection of at least one phase discontinuity of a set of phase coherence discontinuities to a second node.   
     
     
         29 . A method of wireless communication at a second node, comprising:
 receiving a set of sensing signals;   receiving, after a reception of at least one sensing signal of the set of sensing signals, a phase coherence indication based on a set of tracked phase coherence discontinuities associated with the set of sensing signals from a first node; and   measuring the set of sensing signals based on the phase coherence indication.